Apr-29-2019, 09:40 PM
This code is supposed to multiply a matrix by a vector without the aid of a .dot function.
In order to make sure I get the right result, I use the @ command right after printing the function.
This code prints
[7, 15, 24]
when using the function
and
[ 6 15 24]
when using the dot product command.
Can anyone please tell me where this is wrong?
Why does the function print 7 instead of 6?
In order to make sure I get the right result, I use the @ command right after printing the function.
This code prints
[7, 15, 24]
when using the function
and
[ 6 15 24]
when using the dot product command.
Can anyone please tell me where this is wrong?
Why does the function print 7 instead of 6?
def matvec1(a,b): if a.shape[0] == b.shape[0]: for i in range(len(a)): newarray = [] s = 0 for j in range(len(b)): s += a[i][j] * b[i] newarray.append(s) return newarray else: return "The matrix and vector aren't compatible." A1=np.array([[1,2,3],[4,5,6],[7,8,9] ]) B1=np.array([1,1,1]) print(matvec1(A1,B1)) print(A1@B1)